US4136714A - Accumulator drain closure - Google Patents

Accumulator drain closure Download PDF

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Publication number
US4136714A
US4136714A US05/754,552 US75455276A US4136714A US 4136714 A US4136714 A US 4136714A US 75455276 A US75455276 A US 75455276A US 4136714 A US4136714 A US 4136714A
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US
United States
Prior art keywords
accumulator
housing
port
piston
drain
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US05/754,552
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English (en)
Inventor
David W. Jones
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CREAVCO Inc
Original Assignee
CREAVCO Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CREAVCO Inc filed Critical CREAVCO Inc
Priority to US05/754,552 priority Critical patent/US4136714A/en
Priority to GB53467/77A priority patent/GB1592597A/en
Priority to DE19772757549 priority patent/DE2757549A1/de
Priority to FR7739131A priority patent/FR2378966A1/fr
Priority to JP15660177A priority patent/JPS53111517A/ja
Application granted granted Critical
Publication of US4136714A publication Critical patent/US4136714A/en
Assigned to HYDRODYNE INDUSTRIES, INC, 35 GILPIN AVE., HAUPPAUGE, NY A NY CORP. reassignment HYDRODYNE INDUSTRIES, INC, 35 GILPIN AVE., HAUPPAUGE, NY A NY CORP. SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NATIONAL WESTMINSTER BANK USA.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/04—Accumulators
    • F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
    • F15B1/10—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means
    • F15B1/18—Anti-extrusion means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/20—Accumulator cushioning means
    • F15B2201/205—Accumulator cushioning means using gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/315—Accumulator separating means having flexible separating means
    • F15B2201/3152—Accumulator separating means having flexible separating means the flexible separating means being bladders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/415—Gas ports
    • F15B2201/4155—Gas ports having valve means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/43—Anti-extrusion means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/60—Assembling or methods for making accumulators
    • F15B2201/615—Assembling or methods for making ports therefor

Definitions

  • This invention pertains to drain closures and, more particularly, to drain closures of the type used in connection with accumulators.
  • One common type of accumulator has a rigid container with a flexible and expansible bladder therein.
  • the bladder may be filled with a compressible fluid, such as a gas. Air or any inert gas may be used.
  • the bladder is usually pressurized through approximately one half the total system pressure.
  • a substance is stored which is, relative to the gas, non-compressible.
  • This substance which is often an oil or another liquid used in hydraulics, is stored within the accumulator at a higher pressure.
  • the compressible gas may be compressed by the relatively non-compressible oil until the pressures in the accumulator are equalized.
  • the stored energy in the bladder will force the stored non-compressible oil through the accumulator drain until, ideally, all the oil has been expelled from the accumulator.
  • energy stored within the compressed bladder causes the bladder to expand until it completely fills the chamber. The expanding bladder depresses a drain closure.
  • a relatively strong spring is used to bias open the valve closure.
  • the spring cannot be so strong as to keep the closure open so that the bladder extrudes past the drain closure head, with the above-indicated resulting injury.
  • a relatively weak spring is used to insure that the drain closure closes before the bladder can be extruded, the force of the bladder immediately overcomes the force of the spring and closes the drain closure while the accumulator is still charged with a considerable quantity of the stored oil.
  • the flow of such fluid would result in a low pressure area beneath the drain closure and a high pressure area within the accumulator chamber.
  • a relatively weak spring would not be able to overcome the differential pressure on both sides of the closure head and the latter may close almost immediately after the flow of the stored oil begins.
  • Mercier in U.S. Pat. No. 2,932,320, provides a valve in which a generally cylindrical drain has a hollow piston slidable secured therein.
  • a leaf spring is within the drain housing and bears against the side walls thereof, and is secured within the piston centrally to the piston top.
  • Circular holes are in the cylindrical side walls of the hollow piston to permit the stored oil to enter and leave the accumulator chamber through the drain.
  • the valve member provided by Mercier is characterized by having a lip which overhangs the accumulator port, so as to seal the drain shut.
  • Mercier in U.S. Pat. No. Re. 23,333, proposes another valve construction for an accumulator, in which the hollow piston is centrally supported by a coil spring.
  • the hollow piston is centrally supported by a coil spring.
  • the apertures in the side of the piston are generally circular in configuration and extend radially with respect to the cylindrical piston.
  • Still another device is offered by EMG Hydraulics, Inc. of Santa Monica, California, in which a poppet valve is disclosed.
  • a solid valve stem supports a valve head which is chamferred so as to fit into registry with the accumulator port inside the accumulator housing.
  • a coiled spring is about the stem of the poppet and resiliently pushes the head upwardly.
  • the devices proposed are valves and the valve closures proposed are intended to seal shut the opening once the bladder has pressed the closure shut. Because of the emphasis upon tight sealing, the overhanging lip of the devices proposed by Berger and Mercier (U.S. Pat. No. 2,932,320), as well as the engaging edges of the EMG Hydraulics, Inc. device, tend to catch or engage the bladder and damage it. All the devices have in common the fact that the spring used to urge the closure into an open position are directly in the flow of the stored material. It is believed that the impingement of such material upon the spring will have a detrimental effect. It may vary the spring's resiliency in response to the flow-rate, direction of flow, and viscosity of the stored substance.
  • the springs bear against the underside of the closure top because the center support provided by the spring (e.g. Mercier in U.S. Pat. No. Re. 23,333), the diametral clearance between the housing and valve must be snug in order to avoid having the valve pivot in the housing and scar the housing wall. This requirement further blocks the flow of stored substances from the accumulator once the port is closed by the valve.
  • valve drain holes in hollow valves tend to be small and circular. Liquids flowing from the accumulator chamber and into the drain are required to change direction sharply thereby reducing pressure in the valve. The increased pressure differential between the valve and the accumulator may cause premature closing of the valve. A similar defect may be seen in the EMG device in which a member is inserted in the drain for supporting the centrally located spring and poppet valve. The liquid flow area is sharply constricted to thereby increase the pressure differential.
  • Prior art closure valve-type devices have proven to be inefficient, tending to prematurely close and entrapping the stored medium and, in some designs, capturing and damaging the bladder.
  • a closure device for use in an accumulator.
  • the accumulator may be of a type which has a bladder therein and is used to store substances.
  • the closure device comprises a drain housing having a port through which the substances pass.
  • a hollow closure member is disposed in combination with the drain housing and has a closed position for closing the accumulator port.
  • the closure member is slidable with respect to the housing to an open condition.
  • the member is hollow and has apertures therein. The apertures permit the substances to enter and leave the accumulator through the member. At least one of the aperture walls of the member is disposed at an angle to the path the medium defines as it leaves the accumulator.
  • a closure device is designed for use in an accumulator of the type that stores substances and has a bladder therein.
  • the closure device comprises a drain housing having an accumulator port.
  • a drain closure member is provided in combination with the housing. The member in the closed position closes the accumulator port, thereby preventing the bladder from entering the housing.
  • the closure member has a non-closed condition. Substances enter and leave the accumulator through the drain housing by a predetermined path.
  • resilient means within the housing for yieldably urging the member into the non-closed position. The resilient means is so disposed within the housing so as to be spaced from the predetermined path.
  • a closure device for use in an accumulator of the type having a bladder therein and which stores substances.
  • the closure device includes a drain housing having an accumulator port within the accumulator.
  • An accumulator port closure member is provided and extends from within the housing and through the accumulator port so as to, in one position, close the port to the bladder and, in another position, being extended from within the drain housing and without the accumulator port.
  • the closure member has at least at one end thereof terminating within the housing.
  • resilient means within the housing for resiliently urging the member into an open position. The resilient means abuts the member substantially at the end which is within the housing.
  • FIG. 1 is a partially sectioned view of the drain closure as constructed in accordance with the teachings of this invention
  • FIG. 2 is an enlarged sectional view of the drain closure of FIG. 1;
  • FIG. 3 is a sectional view of the piston of FIG. 2 taken along lines 3--3 and looking in the direction of the arrows.
  • An accumulator particularly the bladder type accumulator, stores a substance -- usually such a substance as oil or the like -- within a rigid accumulator chamber.
  • a bladder within the accumulator chamber is inflated with a compressible gas.
  • the accumulator is part of an overall system.
  • the pressure in the bladder will, therefore, become, by comparison, larger than the pressure of the oil in the accumulator.
  • the bladder will expand within the accumulator chamber until it has forced out most of the oil or, as in most prior art devices, prematurely closes the drain closure or drain valve.
  • the storage of the oil actually occurs with the drain closure in an open condition.
  • the drain closure When the drain closure is closed, its essential purpose is to inhibit or prevent the bladder from extruding into the drain or being grasped and pinched by the drain closure.
  • FIG. 1 a typical rigid accumulator 10 (FIG. 1) which has a generally cylindrical shape and defines therein an accumulator chamber 12.
  • a bladder 14 having a construction well known in the art.
  • the bladder 14 may be simply attached to the accumulator 10 at a point 16.
  • the bladder 14 is expansible or compressible under the pressure of the stored substance which, as indicated above, is generally oil or the like.
  • the bladder 14 is secured, as indicated, at its upper end at 16 within the accumulator chamber 12 and is fitted at this point 16 with a valve 18 for filling the bladder 14 with nitrogen under pressure.
  • the lower end 20 of the bladder 14 is free within the accumulator 10.
  • An accumulator closure device 22 (FIGS. 1 and 2) is shown at the base 24 of the accumulator chamber 12.
  • the closure device 22 generally comprises a drain housing 26. Within the drain housing is a resilient means 28. A closure member 30, for closing an accumulator port 32, is within the housing 26. The resilient means 28 is within the drain housing 26 and biases the closure member 30 upwardly and through the accumulator port 32 in the drain housing 26.
  • the drain housing 26 may be made of any structural material such as steel, cast aluminum, or the like.
  • the drain housing 26 (FIG. 2) is hollow and may have a generally cylindrical shape, with accumulator and line ports 32 and 34, respectively, at opposed ends.
  • the interior portion of the housing 26 may comprise a plurality of cylindrically shaped juxtaposed portions which proceed coaxially and stepwise from the widest opening at the accumulator port 32 down to a smaller diameter line port end 34.
  • the widest opening 40 of the accumulator port 32 may be threaded and extend for a fraction of the overall length of the housing 26.
  • the axial length of the widest opening 40 may be 0.375 inches and have a diameter of 2 and 5/8 inches.
  • the next portion 42 forms that part of the housing 26 which retains the resilient means 28 and a substantial part of the closure member 30.
  • the diameter may be somewhat shorter and occupy a substantial part of the axial length of the drain 26.
  • the diameter of this portion 42 may be 2.28 inches and the axial length may be 4 inches.
  • the purpose of the main part 42 of the housing 26 will be discussed hereinafter. (All dimensions provided herein are for illustrative purposes only.)
  • the final narrowed dimensioned portion 44 comprises a fitting to be secured at the line port 34.
  • the step 46 to this part 44 is defined by a radially extending shelf 46.
  • the fitting end 44 may have, for example, a diameter of 17/8 inches and a length of approximately 1.67 inches.
  • the resilient means 28 which may be, for example, a coiled cylindrical spring, may be disposed within the central portion 42 of the drain housing 26 and so dimensioned as to rest upon the step 46.
  • the spring 28 is so dimensioned as to conform to the cylindrical wall which defines the central part 42 of the drain housing 26.
  • the spring 28 may extend upwardly approximately half the length of the central part 42.
  • the closure member 30 may be, for example, a generally cylindrical cup-like member, with its closed end 48 so disposed as to be within the accumulator chamber 12.
  • This closure member or piston 30 may have a generally cylindrical configuration with an enlarged collar 40 substantially about the middle thereof.
  • the piston 30 may be made of any rigid material, such as aluminum or the like.
  • the collar 50 is defined by radially extending surfaces at the top 52 and bottom 54. These surfaces 52 and 54, respectively, intersect the cylindrical surface of the remainder of the piston 30.
  • the bottom radial portion 54 is so dimensioned as to engage the top 56 of the spring 28.
  • the lower cylindrical portion 58 of the piston 30 is so dimensioned as to fit within the spring 48.
  • the base thereof 58 may have a chamfer 60 to aid in the disposing of the piston 30 within the spring 28.
  • a retaining ring 62 may be threaded into the accumulator port 32.
  • the retaining ring 62 upon being threaded into the housing 26 at the uppermost part 40, thereby narrows the opening and the extending edge thereof engages the top radial surface 52 of the collar 50 of the piston 30, to thereby retain the piston 30 and spring 28 within the drain housing 26.
  • the piston collar 50 may have an overall diameter of 2.275 inches and the narrower portions 66 and 58 above and below the collar 50 have a diameter of approximately 2 inches.
  • the piston 30 is hollow. It is also provided with a series of apertures 68 or openings within the cylindrical side wall 70 thereof so as to permit the stored oil (not shown) to enter and leave the accumulator chamber 12.
  • These apertures 68 may, preferably, take the form of substantially eliptical openings, with the major axes being parallel to the axis of the piston 30.
  • the top wall 72 of each aperture 68 may be canted at an angle with respect to the radii of the piston 30. This angle could be, for example, at approximately 9°. The function of this angulation of the top wall 72 of each aperture 68 will be more fully discussed below.
  • the narrower top portion 66 of the piston 30 is substantially longer than the narrower bottom portion 58.
  • the top portion 86 may have a length of 1.125 inches and the bottom portion a length of approximately 0.69 inches.
  • the assembled drain housing 26, with the spring 28, piston 30, and retaining ring 62 in place may be disposed with the flange portion 36 against the inner surface 38 of the accumulator chamber 12.
  • a selected outer portion 74 of the housing 26 may be threaded.
  • a retaining ring 76 (FIG. 1) may be threaded about the threaded portion 74 and against the accumulator housing 12 so as to secure the drain housing 26 in place.
  • the spring 28 urges the piston 30 from almost the base thereof, exerting pressure at the lower radial wall 54 of the collar 50. This is a substantial advantage over prior art devices in which the spring extended to the closure top. It is axiomatic that the shorter the spring travel, the longer will be the life of the spring.
  • the spring 28 is disposed along the outer wall of the widest portion 42 of the drain housing (with the retaining ring in place). Thus, as oil enters and leaves the drain housing 26 and through the apertures 68 of the piston 30, the oil does not come into contact with the spring 28. This keeps the spring 28 clear of the effects of such substances.
  • Still another important feature of this invention is the canted wall opening 72. If the stored oil were to stream out of the accumulator chamber 12 through circular piston openings, as is commonly known in the art, the sudden change in the direction of the flow would cause a pressure drop within the hollow piston 30. This drop in pressure would, it is believed, cause the bladder 14 to close the piston 30 at an earlier point in time and trap oil inside the accumulator. It is desirable, however, to keep the piston 30 open for as long as possible until every remaining bit of stored oil is removed. By canting the top wall 72 of the apertures 68, the flow of oil out of the accumulator chamber 12 impinges upon the wall 72 to develop a vector force upward in a direction urged by the spring 28.
  • This clearance which may be of the order of 15 thousandths of an inch, permits the flow of oil from the accumulator chamber 12 with the piston 30 in a closed position. This clearance is made possible by the fact that the spring bearing surface is upon the collar 50 at the outer surface of the piston 30. This should be compared with such devices as the one proposed by Merceir in U.S. Pat. No. Re. 32,333. Merceir calls for premature closing of his valve. In order to remove traped oil, he provides for small drain holes from within the housing and then to the valve.
  • the present invention provides for larger drain holes, direct flow between the housing and the piston, and timed closing of the piston to thereby insure not only the complete removal of all stored oil by the expanding bladder, but at a rate which, it is believed, has not been heretofore experienced.
  • the difference, as pointed out above, is that of a closure to the bladder, but not a valve -- as provided in prior art devices.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Closures For Containers (AREA)
US05/754,552 1976-12-27 1976-12-27 Accumulator drain closure Expired - Lifetime US4136714A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US05/754,552 US4136714A (en) 1976-12-27 1976-12-27 Accumulator drain closure
GB53467/77A GB1592597A (en) 1976-12-27 1977-12-22 Accumulator drain closure
DE19772757549 DE2757549A1 (de) 1976-12-27 1977-12-23 Entleerungsverschluss fuer speicherbehaelter
FR7739131A FR2378966A1 (fr) 1976-12-27 1977-12-23 Dispositif d'obturation pour accumulateur
JP15660177A JPS53111517A (en) 1976-12-27 1977-12-27 Device for closing accumulator drain

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/754,552 US4136714A (en) 1976-12-27 1976-12-27 Accumulator drain closure

Publications (1)

Publication Number Publication Date
US4136714A true US4136714A (en) 1979-01-30

Family

ID=25035294

Family Applications (1)

Application Number Title Priority Date Filing Date
US05/754,552 Expired - Lifetime US4136714A (en) 1976-12-27 1976-12-27 Accumulator drain closure

Country Status (5)

Country Link
US (1) US4136714A (OSRAM)
JP (1) JPS53111517A (OSRAM)
DE (1) DE2757549A1 (OSRAM)
FR (1) FR2378966A1 (OSRAM)
GB (1) GB1592597A (OSRAM)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6343622B1 (en) * 2000-03-31 2002-02-05 Flamco B.V. Flow-through connection member for an expansion tank
US6478051B1 (en) * 1998-11-25 2002-11-12 Continental Teves Ag & Co., Ohg Pressure means storage device
US20040020543A1 (en) * 2000-10-18 2004-02-05 Norbert Weber Hydroaccumulator, in particular a bladder accumulator
US20040217559A1 (en) * 2003-02-10 2004-11-04 Michael Schlitzkus Device for damping pressure pulsations
US20130000735A1 (en) * 2010-03-19 2013-01-03 Blaze Martin J Pressure relief apparatus for hydropneumatic vessel
US20170088109A1 (en) * 2014-05-21 2017-03-30 Robert Bosch Gmbh Damping Device
US10276067B2 (en) 2014-06-30 2019-04-30 Robert Bosch Gmbh Electric motor construction kit and electric motor

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2511444B1 (fr) * 1981-08-12 1988-07-01 Christie Hydraulics Ltd Perfectionnements aux accumulateurs hydropneumatiques
JPS60142301U (ja) * 1984-02-29 1985-09-20 中村工機株式会社 アキユムレ−タ
US4921004A (en) * 1989-08-15 1990-05-01 Amtrol Inc. Piercing surge regulator valve and apparatus
DE10337744B3 (de) * 2003-08-13 2005-03-17 Hydac Technology Gmbh Vorrichtung zum Dämpfen von Druckstößen

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2345124A (en) * 1941-12-01 1944-03-28 New York Air Brake Co Accumulator
US2731038A (en) * 1953-01-26 1956-01-17 Purcell Howard Milne Hydraulic accumulator

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE23333E (en) * 1951-01-23 Storage device
US2659391A (en) * 1946-07-02 1953-11-17 Berger Maurice Pierre Pneumatic accumulator
FR1039253A (fr) * 1951-06-30 1953-10-06 Valve de fermeture pour accumulateurs hydrauliques
FR1154187A (fr) * 1955-06-14 1958-04-03 Greer Hydraulics Inc Accumulateur de pression
US2932320A (en) * 1956-02-23 1960-04-12 Mercier Jean Closure valve for the outlet port of a pressure accumulator
FR1224236A (fr) * 1959-02-05 1960-06-22 Perfectionnements aux valves
GB930900A (en) * 1962-01-12 1963-07-10 Greer Hydraulics Inc Pressure vessel

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2345124A (en) * 1941-12-01 1944-03-28 New York Air Brake Co Accumulator
US2731038A (en) * 1953-01-26 1956-01-17 Purcell Howard Milne Hydraulic accumulator

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6478051B1 (en) * 1998-11-25 2002-11-12 Continental Teves Ag & Co., Ohg Pressure means storage device
US6343622B1 (en) * 2000-03-31 2002-02-05 Flamco B.V. Flow-through connection member for an expansion tank
US20040020543A1 (en) * 2000-10-18 2004-02-05 Norbert Weber Hydroaccumulator, in particular a bladder accumulator
US6988514B2 (en) * 2000-10-18 2006-01-24 Hydac Technology Gmbh Hydroaccumulator, in a particular a bladder accumulator
US20040217559A1 (en) * 2003-02-10 2004-11-04 Michael Schlitzkus Device for damping pressure pulsations
US7240696B2 (en) * 2003-02-10 2007-07-10 Robert Bosch Gmbh Device for damping pressure pulsations
US20130000735A1 (en) * 2010-03-19 2013-01-03 Blaze Martin J Pressure relief apparatus for hydropneumatic vessel
US20170088109A1 (en) * 2014-05-21 2017-03-30 Robert Bosch Gmbh Damping Device
US10227065B2 (en) * 2014-05-21 2019-03-12 Robert Bosch Gmbh Damping device
US10276067B2 (en) 2014-06-30 2019-04-30 Robert Bosch Gmbh Electric motor construction kit and electric motor

Also Published As

Publication number Publication date
GB1592597A (en) 1981-07-08
FR2378966B1 (OSRAM) 1981-11-20
JPS53111517A (en) 1978-09-29
DE2757549A1 (de) 1978-11-09
FR2378966A1 (fr) 1978-08-25

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AS Assignment

Owner name: HYDRODYNE INDUSTRIES, INC, 35 GILPIN AVE., HAUPPAU

Free format text: SECURITY INTEREST;ASSIGNOR:NATIONAL WESTMINSTER BANK USA.;REEL/FRAME:004197/0266

Effective date: 19831104